Cylinder-lock.



E. EPSTEI'N.

CYLINDER LOCK.

- APPLICATION FILED N313, 1914.

Patented July 7, 1914.

Fig. 3.

vE E Tem, wwwcfff 15G/WAM I Mvfs- ELI EPSTEIN, 0F BOSTGN, MASSACHUSETTS.

CYLINDER-LOCK'.

i .i nelson Specification of Letters latent.

Patented July 3, 19rd.

and by meansvoil which the lock is made nonpickable.

The ordinary cylinder lock can be picked by using a properly-shapedkev by which the diii'erent twofpart tumbler pins can be raised into a position in which the division line between the two parts comes in line with the` periphery of the cylinder, and at the same time inserting a thin piece of metal between the cylinder and the walls ofthe bore of the casing and between the two parts of eachy pin tumbler as it is brought i'nto proper position, thus holding the outer portion or' each pin within the casing. ln order to change a lock of this nature over into one which cannot be picked in the above way, l propose to make the cylinder of the lock lwith a peripheral groove and to provide the casing of the lock with means operating insaid groove, which y means forms an obstruction to the insertion of a lock-'picking implement. l have shown in the drawings some embodiments of the invention which have been' selected for the purpose of disclosing the principle thereof, and l will now describe such embodiments and then point out the novel features in the appended claims. I

Referring to the drawings wherein l .have illustrated some embodiments of my invention, Figure l is a sectional view through a cylinder lock into which my invention has been incorporated taken on the line a'-a, Fig. 2; lig.y 2 is a sectional view lon the line a-', Fig, 1;"iii`ig. 3 is a view showing a different embodiment of the invention; Fig. l is a section on the line y-y, Fig. 3.

Referring first to the embodiment shown in Fi' s, l and 2, l desi nates the casing of a c lin er lock and 2 tilievcylinder vor plug t erein having the usual ey-hole Vslot 3. The 'casing and the cylinder are rovided with alincd recesses e to receive vt e usual two-part tumbler pins thct are acted upon' by the springs 6 within the casing as usual. f lhe two parts of each tumbler pin are des-l ignated 5 and 7, the portion 5 constituting the part which is received within-the casing and the-portion 7 constituting the part which is received within the cylinder 2. An ordinary cylinder lock of this nature can be more or less readily pickedf'by means of a lockpicking implement in :the form of a strip of thin metal that can be inserted between the cylinder 2 of the lock and the wall ofthe cylinder-receiving borev in the casing, and a suitable key or other implement by which the tumbler pins can be successively lined up.l In picking a cylinder lock with these implements, the end of the cylinder is first drilled, as at 20, to periiiit the implement 70 to be introduced between the cylinder 2 and casing 1, and then a key of special shape is inserted into the key slot 3 and manipulated to line up the tumbler pins successively, and simultaneously the implement 7 0 is manipulated so that it will pass between the sections of each tumbler pin as the latter is lined up thereby to hold the outer section 5 back in the casing. By this means all of the vario-us tumbler pinscan be lined up and the outer ends thereof' can be held. back in the recesses Ltof the casing l so as to permit the cylinder to be turned.

My invention has for its object to provide a novel construction whichr can be. incor porated into any .cylinder lock now in use, and by which the latter may be made entirely non-pickable in the manner above described, and l accomplish this object by providing the cylinder. 2 with a peripheral groove and by arranging a barrier or stop vin the casing which normally occupies said groove and serves tofprevent the passage of an implement 70. ,ln Figs. l and 2 l have shown an embodiment of. the invention whereby this barriergis constituted byione of the sections 5 of one of the tumbler pins, and in incorporating my invention into a lock l tirst remove. the barrel 2 from' the I,

casing,'take out the 'section 7 oi one of the tumblerpins from the cylinder and ormin the cylinder agroove. 8 which intersects the recess formerly occupied. bythe removed tumbler pin section, and then` Il los' ill up th recess with solder or other. ma-

terial 10, and re-insert the cylinder into the casing again. When' this is done the section 5a of the tumbler pin corresponding to'v the plugged recess` :in the cylinder' will .assume the position shown v'lol-er piiisland that when they are so lined up the cylinder can be turned to unlock the door because the filling l comes just iiush with the bottom of the groove 8. This tumbleipin section a, however, constitutes a barrier which will absolutely prevent the insertion of an implement 70 past it and Will, therefore, prevent the tumbler pins to the left of the barrierfromv being manipulated by an instrument 70 to pick the lock. I will preferably make the groove 8 so that it extends only partially around the cylin` der 2, the ends of the groove being tapered, as shown in Fig. l, so that by turning the cylinder half Way around the latter can be removed from the casiiig.

In Figs. 3 and 4 I have shown an embodii ment of the invention wherein the barrier 1s 1n the form of a bar or member l1 extend ing transversely through the casing and occupying a groove S inthe barrel. The bar 11 and groove 8 can be formed in the lock after the saineis made, and when the har l5I l also 'either removing one ofthe cylinder secis i place it constitutes a barrier which will prohibit the picking of the lock, as above described. In other respects, the invention shown in, Figs. 3 and 4 is the saine as that shown'fin` Figs. l and 2.

One of the important'features of my inbe incorporated in a' vention is that it can lock whichv is already made, for the locks Which are noW in use can. be readily changed over to make them non-pickable in accordance with my .invention by removing the cylinder, forming the groove therein and tions of a tumbler pin and filling up the corresponding hole, as shown in F ig., 1, or by introducing a barrier ll,as shown in Figs. 3 and 4.

In the embodiment shown in Figs. 3 and p 4 it is necessary to iise a key for operating the lock which has a groove cut across its back corresponding to the groove 8 in the cylinder.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In a cylinderlock, the combination with.

a casing, `of a cylinder within said' casing, said cylinder and casing havingv tumbler pin receiving recesses, actuated tumbler pins in saidrecesses,l said cylinder having a peripheral groove of varying depth extending partially therearound, and a spring-pressed pin carried by the casing and occupying said groove thereby preventingr a lock-picking implement from being inserted between the cylinder and the wall vof the bore in line with said tumbler pins.

2. Inia cylinder lock, the combination with a casing, of a cylinder Within said casing, lsaid cylinder and casing having a plurality of ti1mblerpinreceiving recesses,

,two-part spring-actuated tumbler-pins in said recesses, said cylinder having a peripheral groove situated between the two end recesses, -and/means carried by the casing and 'ocupyin'g said groove thereby preventing a lockpicking implement from being inserted from either end ofthe loclrbetween the cylinder and the wall of the bore in linewith said tumbler-pins.

VIn testimony whereof, I have signed my name to this specification, in the presence o' two subscribing Witnesses.

ELI EPSTEIN. Witnesses:

Louis C. SMITH, vTHOMAS J. DRUMMOND.

two part spring. 

